山区沟道型弃渣填埋场稳定性分析研究  

Stability Analysis of Ditch-Type Waste Soil Landfill Site in Mountainous Area

作　　者：谢昌兵 黄秋香[1] 郭昊锋 沈吉鹏 XIE Changbing;HUANG Qiuxiang;GUO Haofeng;SHEN Jipeng(State Key Laboratory of Geohazard Prevention and Geo-Environment Protection,Chengdu University of Technology,Chengdu 610059)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《土工基础》2023年第1期94-98,共5页Soil Engineering and Foundation

摘　　要：弃渣填埋场数量众多且分布广泛,受长期运行及运营期内各种不良地质灾害影响,可能对其稳定性状产生威胁,在各类弃渣场中又尤以山区沟道型最为突出。以汶川县毛安沟弃渣填埋场为例,依据场地等高线数据及现场地质勘察,利用FLAC3D软件建立三维模型,模拟分析了场区遭遇强降雨并诱发泥石流形成过流加载的情况;通过模拟结果中的应力及应变变化规律,得出场区受泥石流影响的响应特征。研究表明:降雨入渗及泥石流过流加载,引起表层拉应力增加,导致局部出现张拉塑性屈服为主要响应规律;场区潜在破坏形式为因后缘张拉破坏而产生的浅表层滑动。研究成果可为场区治理及类似弃渣场设计防护提供参考。The waste soil landfill sites are numerous and widely distributed.Affected by various adverse geological hazards during the operation period,the stability of theses landfill stie vary significantly and some of them might be critical.Among various waste soil sites that with slope stability concerns,the mountain ditch type of landfill site is the most prominent.However,few studies are reported.This paper presents the stability analysis of the Mao’an waste soil landfill site.Based on the site topography survey and subsurface geotechnical investigation results,the three-dimensional numerical models were established with FLAC3D software.The surcharge conditions induced by the debris flow as the results of the strong rainfall are analyzed.The response characteristics of the debris flow in the field area are obtained through the stress and strain variation relation in the numerical simulation results.The results show that the rainfall infiltration and debris flow overflow loading lead to the increase of the surface tensile stress,which leads to a local tensile plastic yield.The potential failure form in the field is the shallow surface sliding due to the tensile failure of trailing edge.The research results can provide a reference for the remediation of the failed landfill site and protection of landfill sites of the same type.

关 键 词：山区沟道 填埋场 稳定性 泥石流 数值模拟 

分 类 号：P642[天文地球—工程地质学]